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@ARTICLE{Hofzumahaus:33390,
      author       = {Hofzumahaus, A. and Kraus, A. and Kylling, A. and Zerefos,
                      C. S.},
      title        = {{S}olar actinic radiation (280-420 nm) in the cloud-free
                      troposphere between ground and 12 km altitude : measurements
                      and model results},
      journal      = {Journal of geophysical research / Atmospheres},
      volume       = {107},
      issn         = {0022-1406},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-33390},
      pages        = {PAU 6-1 - 6-6},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {[1] Airborne measurements of the spectrally resolved
                      actinic flux (280-420 nm) between the ground and 12 km
                      altitude have been made using a new calibrated dual-channel
                      spectroradiometer. The measurements were made as part of the
                      Photochemical Activity and Ultraviolet Radiation/Altitude
                      Dependence of the Tropospheric Ozone Photolysis (PAUR/ATOP)
                      measurement campaign in Greece during June 1996. Flights
                      were made over the Agean Sea under cloudless conditions for
                      various aerosol loads and solar zenith angles. The spectral
                      actinic flux measurements are compared with radiative
                      transfer model simulations based on the multistream discrete
                      ordinate radiative transfer (DISORT) algorithm. All input to
                      the radiative transfer model was provided by independent
                      measurements performed simultaneously on the nearby island
                      of Agios Efstratios. For altitudes between 3000-12,000 m the
                      agreement between the measurements and the model simulations
                      is within $+/-5\%$ for wavelengths larger than 310 nm and
                      within $+/-10\%$ at 295-310 nm. For the lowest flight
                      altitude, 108 m, the model underestimates the measured
                      actinic flux systematically by about $12\%.$ This may be
                      partly explained by uncertainties in the aerosol optical
                      properties and the surface albedo. Flights on days with
                      small and large amounts of aerosols showed that under
                      otherwise identical conditions the actinic flux increased by
                      up to $10\%$ when the aerosol amount was larger.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000180427400007},
      doi          = {10.1029/2001JD900142},
      url          = {https://juser.fz-juelich.de/record/33390},
}